I can’t definitively tell by the data sheet if the KT output would change if you pressed a second key while the first one is still pressed, but I’d guess that the fist output would stay latched unless you fully released the first key prior to the second press. If reading the decoded data from datasehet DTMF signal is all you want to do, programming a microcontroller seems unnecessarily complicated. Email Required, but never shown.
Incidentally, another approach would be to simply feed audio into the USB port using an off-the-shelf product, and then have the computer perform the DTMF recognition. Datasheeet Questions Started by norbss Yesterday at Click here to register now. In the case of MT I have to design complex ring detection circuit to automatically off-hook.
KT3170 Vs. MT8870 DTMF Decoders
You need to learn about the phone system in your country and it might be different in different parts of your country. Replacing a 4 pin leaded inductor with a 2 pin Started by gkmaia Yesterday at Post as a guest Name.
I don’t know what your transmit latency will be. You might have to just try and see.
KT Datasheet, PDF – Alldatasheet
Home Questions Tags Users Unanswered. If you press one key and then quickly press the next, you should be okay and get the second keypress as the maximum interdigit pause time is 40 ms.
When you get the interrupt, read the Q1 – Q4 data, do whatever pre-processing you may want and send it dataeheet the USB port. The way I interpret the data sheet, Dataseet would connect Q1 – Q4 to digital inputs on the microcontroller. Thanks a lot for suggesting the Teensy board, Joby: I don’t know anything about the delay your FM modulator and demodulator will add to the system, but I suspect the total latency will still be well under 0.
KT Datasheet(PDF) – Samsung semiconductor
If the computer sees something that starts out looking like a DTMF tone but the frequencies change after ms, it might be able to depending upon the application retroactively determine that the tones weren’t really DTMF after all. Sign up or log in Sign up using Google.
NS Gopikrishnan 5. Media New media New comments Search media. May I know how to transfer the data from pins: That is if I press a button say 1 and datasueet within the same second if I press key datasheeet Will it be able to recieve and decode the DTMF correctly with proper time synchronization?
To participate you need to register. Articles Top Articles Search resources. As long as you aren’t faster than 40 ms between presses, you’ll get the second press.